Table 2. Open in new tab Descriptive of...

		Absolute values		Difference to previous time-point
Intercanine width	9 years	n = 101 21.4 (3.0)	n = 42 21.5 (2.5)	n = 59 21.3 (3.4)	.82	-	-	-
	12 years	n = 109 24.6 (2.0)	n = 50 25.2 (1.6)	n = 59 24.1 (2.2)	.01	n = 79 3.40 (3.22)	n = 38 3.99 (2.48)	n = 41 2.85 (3.74)	.21
	15 years	n = 79 24.8 (1.9)	n = 34 25.2 (1.8)	n = 45 24.6 (2.0)	.20	n = 61 –0.10 (2.14)	n = 30 –0.02 (2.16)	n = 31 –0.16 (2.15)	.76
Maxillary width	9 years	n = 101 54.4 (2.6)	n = 42 55.0 (2.6)	n = 59 54.1 (2.5)	.15	-	-	-
	12 years	n = 109 57.5 (3.2)	n = 50 58.0 (3.3)	n = 59 57.1 (3.0)	.26	n = 79 2.68 (2.18)	n = 38 2.66 (2.07)	n = 41 2.69 (2.29)	.97
	15 years	n = 79 59.9 (3.2)	n = 34 60.4 (3.0)	n = 45 59.6 (3.2)	.37	n = 61 2.74 (2.33)	n = 30 3.12 (1.92)	n = 31 2.36 (2.64)	.17
Mandibular width	9 years	n = 101 74.5 (3.4)	n = 42 74.4 (3.7)	n = 59 74.6 (3.2)	.83	-	-	-
	12 years	n = 109 79.1 (3.9)	n = 50 79.2 (3.8)	n = 59 78.9 (4.0)	.71	n = 79 4.53 (2.46)	n = 38 4.82 (2.12)	n = 41 4.26 (2.67)	.36
	15 years	n = 79 82.7 (4.3)	n = 34 82.4 (4.6)	n = 45 82.9 (4.1)	.65	n = 61 4.08 (2.78)	n = 30 3.70 (2.35)	n = 31 4.47 (3.20)	.31
Nasal width	9 years	n = 101 22.8 (1.9)	n = 42 23.2 (2.0)	n = 59 22.6 (1.7)	.25	-	-	-
	12 years	n = 109 24.7 (2.0)	n = 50 24.9 (2.0)	n = 59 24.5 (2.0)	.30	n = 79 1.64 (1.46)	n = 38 1.85 (1.33)	n = 41 1.44 (1.56)	.27
	15 years	n = 79 26.5 (2.4)	n = 34 26.7 (2.4)	n = 45 26.4 (2.4)	.66	n = 61 1.76 (1.50)	n = 30 1.56 (1.55)	n = 31 1.94 (1.45)	.35
Facial width	9 years	n = 101 112.4 (4.9)	n = 42 112.6 (5.2)	n = 59 112.2 (4.7)	.71	-	-	-
	12 years	n = 109 117.9 (5.2)	n = 50 118.2 (5.4)	n = 59 117.8 (5.1)	.75	n = 79 4.97 (3.32)	n = 38 5.58 (2.93)	n = 41 4.41 (3.58)	.15
	15 years	n = 79 123.2 (5.9)	n = 34 123.9 (6.4)	n = 45 122.6 (5.6)	.47	n = 61 5.15 (3.79)	n = 30 4.94 (3.40)	n = 31 5.35 (4.19)	.65

Absolute values

Difference to previous time-point

Total

Monozygotic

Dizygotic

Total

Monozygotic

Dizygotic

Age

n
Mean (SD)

n
MD (SD)

Intercanine width

9 years

n = 101
21.4 (3.0)

n = 42
21.5 (2.5)

n = 59
21.3 (3.4)

.82

12 years

n = 109
24.6 (2.0)

n = 50
25.2 (1.6)

n = 59
24.1 (2.2)

.01

n = 79
3.40 (3.22)

n = 38
3.99 (2.48)

n = 41
2.85 (3.74)

.21

15 years

n = 79
24.8 (1.9)

n = 34
25.2 (1.8)

n = 45
24.6 (2.0)

.20

n = 61
–0.10 (2.14)

n = 30
–0.02 (2.16)

n = 31
–0.16 (2.15)

.76

Maxillary width

9 years

n = 101
54.4 (2.6)

n = 42
55.0 (2.6)

n = 59
54.1 (2.5)

.15

12 years

n = 109
57.5 (3.2)

n = 50
58.0 (3.3)

n = 59
57.1 (3.0)

.26

n = 79
2.68 (2.18)

n = 38
2.66 (2.07)

n = 41
2.69 (2.29)

.97

15 years

n = 79
59.9 (3.2)

n = 34
60.4 (3.0)

n = 45
59.6 (3.2)

.37

n = 61
2.74 (2.33)

n = 30
3.12 (1.92)

n = 31
2.36 (2.64)

.17

Mandibular width

9 years

n = 101
74.5 (3.4)

n = 42
74.4 (3.7)

n = 59
74.6 (3.2)

.83

12 years

n = 109
79.1 (3.9)

n = 50
79.2 (3.8)

n = 59
78.9 (4.0)

.71

n = 79
4.53 (2.46)

n = 38
4.82 (2.12)

n = 41
4.26 (2.67)

.36

15 years

n = 79
82.7 (4.3)

n = 34
82.4 (4.6)

n = 45
82.9 (4.1)

.65

n = 61
4.08 (2.78)

n = 30
3.70 (2.35)

n = 31
4.47 (3.20)

.31

Nasal width

9 years

n = 101
22.8 (1.9)

n = 42
23.2 (2.0)

n = 59
22.6 (1.7)

.25

12 years

n = 109
24.7 (2.0)

n = 50
24.9 (2.0)

n = 59
24.5 (2.0)

.30

n = 79
1.64 (1.46)

n = 38
1.85 (1.33)

n = 41
1.44 (1.56)

.27

15 years

n = 79
26.5 (2.4)

n = 34
26.7 (2.4)

n = 45
26.4 (2.4)

.66

n = 61
1.76 (1.50)

n = 30
1.56 (1.55)

n = 31
1.94 (1.45)

.35

Facial width

9 years

n = 101
112.4 (4.9)

n = 42
112.6 (5.2)

n = 59
112.2 (4.7)

.71

12 years

n = 109
117.9 (5.2)

n = 50
118.2 (5.4)

n = 59
117.8 (5.1)

.75

n = 79
4.97 (3.32)

n = 38
5.58 (2.93)

n = 41
4.41 (3.58)

.15

15 years

n = 79
123.2 (5.9)

n = 34
123.9 (6.4)

n = 45
122.6 (5.6)

.47

n = 61
5.15 (3.79)

n = 30
4.94 (3.40)

n = 31
5.35 (4.19)

.65

		Absolute values		Difference to previous time-point
Intercanine width	9 years	n = 101 21.4 (3.0)	n = 42 21.5 (2.5)	n = 59 21.3 (3.4)	.82	-	-	-
	12 years	n = 109 24.6 (2.0)	n = 50 25.2 (1.6)	n = 59 24.1 (2.2)	.01	n = 79 3.40 (3.22)	n = 38 3.99 (2.48)	n = 41 2.85 (3.74)	.21
	15 years	n = 79 24.8 (1.9)	n = 34 25.2 (1.8)	n = 45 24.6 (2.0)	.20	n = 61 –0.10 (2.14)	n = 30 –0.02 (2.16)	n = 31 –0.16 (2.15)	.76
Maxillary width	9 years	n = 101 54.4 (2.6)	n = 42 55.0 (2.6)	n = 59 54.1 (2.5)	.15	-	-	-
	12 years	n = 109 57.5 (3.2)	n = 50 58.0 (3.3)	n = 59 57.1 (3.0)	.26	n = 79 2.68 (2.18)	n = 38 2.66 (2.07)	n = 41 2.69 (2.29)	.97
	15 years	n = 79 59.9 (3.2)	n = 34 60.4 (3.0)	n = 45 59.6 (3.2)	.37	n = 61 2.74 (2.33)	n = 30 3.12 (1.92)	n = 31 2.36 (2.64)	.17
Mandibular width	9 years	n = 101 74.5 (3.4)	n = 42 74.4 (3.7)	n = 59 74.6 (3.2)	.83	-	-	-
	12 years	n = 109 79.1 (3.9)	n = 50 79.2 (3.8)	n = 59 78.9 (4.0)	.71	n = 79 4.53 (2.46)	n = 38 4.82 (2.12)	n = 41 4.26 (2.67)	.36
	15 years	n = 79 82.7 (4.3)	n = 34 82.4 (4.6)	n = 45 82.9 (4.1)	.65	n = 61 4.08 (2.78)	n = 30 3.70 (2.35)	n = 31 4.47 (3.20)	.31
Nasal width	9 years	n = 101 22.8 (1.9)	n = 42 23.2 (2.0)	n = 59 22.6 (1.7)	.25	-	-	-
	12 years	n = 109 24.7 (2.0)	n = 50 24.9 (2.0)	n = 59 24.5 (2.0)	.30	n = 79 1.64 (1.46)	n = 38 1.85 (1.33)	n = 41 1.44 (1.56)	.27
	15 years	n = 79 26.5 (2.4)	n = 34 26.7 (2.4)	n = 45 26.4 (2.4)	.66	n = 61 1.76 (1.50)	n = 30 1.56 (1.55)	n = 31 1.94 (1.45)	.35
Facial width	9 years	n = 101 112.4 (4.9)	n = 42 112.6 (5.2)	n = 59 112.2 (4.7)	.71	-	-	-
	12 years	n = 109 117.9 (5.2)	n = 50 118.2 (5.4)	n = 59 117.8 (5.1)	.75	n = 79 4.97 (3.32)	n = 38 5.58 (2.93)	n = 41 4.41 (3.58)	.15
	15 years	n = 79 123.2 (5.9)	n = 34 123.9 (6.4)	n = 45 122.6 (5.6)	.47	n = 61 5.15 (3.79)	n = 30 4.94 (3.40)	n = 31 5.35 (4.19)	.65

Table 2.

Open in new tab

Descriptive of each variable overall and for monozygotic/dizygotic twins.

		Absolute values				Difference to previous time-point
		Total	Monozygotic	Dizygotic		Total	Monozygotic	Dizygotic
	Age	n Mean (SD)	n Mean (SD)	n Mean (SD)	P	n MD (SD)	n MD (SD)	n MD (SD)	P
Intercanine width	9 years	n = 101 21.4 (3.0)	n = 42 21.5 (2.5)	n = 59 21.3 (3.4)	.82	-	-	-
	12 years	n = 109 24.6 (2.0)	n = 50 25.2 (1.6)	n = 59 24.1 (2.2)	.01	n = 79 3.40 (3.22)	n = 38 3.99 (2.48)	n = 41 2.85 (3.74)	.21
	15 years	n = 79 24.8 (1.9)	n = 34 25.2 (1.8)	n = 45 24.6 (2.0)	.20	n = 61 –0.10 (2.14)	n = 30 –0.02 (2.16)	n = 31 –0.16 (2.15)	.76
Maxillary width	9 years	n = 101 54.4 (2.6)	n = 42 55.0 (2.6)	n = 59 54.1 (2.5)	.15	-	-	-
	12 years	n = 109 57.5 (3.2)	n = 50 58.0 (3.3)	n = 59 57.1 (3.0)	.26	n = 79 2.68 (2.18)	n = 38 2.66 (2.07)	n = 41 2.69 (2.29)	.97
	15 years	n = 79 59.9 (3.2)	n = 34 60.4 (3.0)	n = 45 59.6 (3.2)	.37	n = 61 2.74 (2.33)	n = 30 3.12 (1.92)	n = 31 2.36 (2.64)	.17
Mandibular width	9 years	n = 101 74.5 (3.4)	n = 42 74.4 (3.7)	n = 59 74.6 (3.2)	.83	-	-	-
	12 years	n = 109 79.1 (3.9)	n = 50 79.2 (3.8)	n = 59 78.9 (4.0)	.71	n = 79 4.53 (2.46)	n = 38 4.82 (2.12)	n = 41 4.26 (2.67)	.36
	15 years	n = 79 82.7 (4.3)	n = 34 82.4 (4.6)	n = 45 82.9 (4.1)	.65	n = 61 4.08 (2.78)	n = 30 3.70 (2.35)	n = 31 4.47 (3.20)	.31
Nasal width	9 years	n = 101 22.8 (1.9)	n = 42 23.2 (2.0)	n = 59 22.6 (1.7)	.25	-	-	-
	12 years	n = 109 24.7 (2.0)	n = 50 24.9 (2.0)	n = 59 24.5 (2.0)	.30	n = 79 1.64 (1.46)	n = 38 1.85 (1.33)	n = 41 1.44 (1.56)	.27
	15 years	n = 79 26.5 (2.4)	n = 34 26.7 (2.4)	n = 45 26.4 (2.4)	.66	n = 61 1.76 (1.50)	n = 30 1.56 (1.55)	n = 31 1.94 (1.45)	.35
Facial width	9 years	n = 101 112.4 (4.9)	n = 42 112.6 (5.2)	n = 59 112.2 (4.7)	.71	-	-	-
	12 years	n = 109 117.9 (5.2)	n = 50 118.2 (5.4)	n = 59 117.8 (5.1)	.75	n = 79 4.97 (3.32)	n = 38 5.58 (2.93)	n = 41 4.41 (3.58)	.15
	15 years	n = 79 123.2 (5.9)	n = 34 123.9 (6.4)	n = 45 122.6 (5.6)	.47	n = 61 5.15 (3.79)	n = 30 4.94 (3.40)	n = 31 5.35 (4.19)	.65

		Absolute values				Difference to previous time-point
		Total	Monozygotic	Dizygotic		Total	Monozygotic	Dizygotic
	Age	n Mean (SD)	n Mean (SD)	n Mean (SD)	P	n MD (SD)	n MD (SD)	n MD (SD)	P
Intercanine width	9 years	n = 101 21.4 (3.0)	n = 42 21.5 (2.5)	n = 59 21.3 (3.4)	.82	-	-	-
	12 years	n = 109 24.6 (2.0)	n = 50 25.2 (1.6)	n = 59 24.1 (2.2)	.01	n = 79 3.40 (3.22)	n = 38 3.99 (2.48)	n = 41 2.85 (3.74)	.21
	15 years	n = 79 24.8 (1.9)	n = 34 25.2 (1.8)	n = 45 24.6 (2.0)	.20	n = 61 –0.10 (2.14)	n = 30 –0.02 (2.16)	n = 31 –0.16 (2.15)	.76
Maxillary width	9 years	n = 101 54.4 (2.6)	n = 42 55.0 (2.6)	n = 59 54.1 (2.5)	.15	-	-	-
	12 years	n = 109 57.5 (3.2)	n = 50 58.0 (3.3)	n = 59 57.1 (3.0)	.26	n = 79 2.68 (2.18)	n = 38 2.66 (2.07)	n = 41 2.69 (2.29)	.97
	15 years	n = 79 59.9 (3.2)	n = 34 60.4 (3.0)	n = 45 59.6 (3.2)	.37	n = 61 2.74 (2.33)	n = 30 3.12 (1.92)	n = 31 2.36 (2.64)	.17
Mandibular width	9 years	n = 101 74.5 (3.4)	n = 42 74.4 (3.7)	n = 59 74.6 (3.2)	.83	-	-	-
	12 years	n = 109 79.1 (3.9)	n = 50 79.2 (3.8)	n = 59 78.9 (4.0)	.71	n = 79 4.53 (2.46)	n = 38 4.82 (2.12)	n = 41 4.26 (2.67)	.36
	15 years	n = 79 82.7 (4.3)	n = 34 82.4 (4.6)	n = 45 82.9 (4.1)	.65	n = 61 4.08 (2.78)	n = 30 3.70 (2.35)	n = 31 4.47 (3.20)	.31
Nasal width	9 years	n = 101 22.8 (1.9)	n = 42 23.2 (2.0)	n = 59 22.6 (1.7)	.25	-	-	-
	12 years	n = 109 24.7 (2.0)	n = 50 24.9 (2.0)	n = 59 24.5 (2.0)	.30	n = 79 1.64 (1.46)	n = 38 1.85 (1.33)	n = 41 1.44 (1.56)	.27
	15 years	n = 79 26.5 (2.4)	n = 34 26.7 (2.4)	n = 45 26.4 (2.4)	.66	n = 61 1.76 (1.50)	n = 30 1.56 (1.55)	n = 31 1.94 (1.45)	.35
Facial width	9 years	n = 101 112.4 (4.9)	n = 42 112.6 (5.2)	n = 59 112.2 (4.7)	.71	-	-	-
	12 years	n = 109 117.9 (5.2)	n = 50 118.2 (5.4)	n = 59 117.8 (5.1)	.75	n = 79 4.97 (3.32)	n = 38 5.58 (2.93)	n = 41 4.41 (3.58)	.15
	15 years	n = 79 123.2 (5.9)	n = 34 123.9 (6.4)	n = 45 122.6 (5.6)	.47	n = 61 5.15 (3.79)	n = 30 4.94 (3.40)	n = 31 5.35 (4.19)	.65

SD, standard deviation; MD, Mean Difference.

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